Signal-valve mechanism.



E. B. NORGAARD. SIGNAL VALVE MECHANISM. APPLICATION FILED SEPT. 16,1913.

Patented May 12, 191% tJ'MTtEtD stares Parana orator.

ELMER E. NOBGAARD, OF COUNCIL BLUFFS, IOWA.

SIGNAL-VALVE MECHANISM.

Specification of Letters Patent.

- Patented May 12, it i it.

Application filed September 16. 1913. Serial No. 789,988.

To (/7! "H /1 0111. it may concern:

lie it known that I, Emma E. Nonoxxuo, a citizen of the United States,residing at Council Blutl's. in the county of Pottawa-ttamic, in theState of Iowa, have invented certain new and useful Improvcnmnts inSignal-Valve Mechanism. and have described the same in the followingspecification, illustrated by the aceompanying drawings.

. My invention relates to that class of valve mechanisms which compriseautomatic pressure valves and are available for charging pneumatic tiresand other receptaclcswvith compressed air, or with other elastic fluidsunder pressure.

By such mechanism applied to an automobile tire it is the main object ofthe invention to produce an audible signal whenever the air pressure inthe tire falls below the normal and predetermined point by reason ofleakage, or puncture: and thereby to enable the driver to avoid runningthe vehicle upon a flat tire. To accomplish this object 1 incorporate ina mechanism of the "specitied class a means for opening the valve whenthe pressure in the tire is reduced and a pneumatic signal operated bythe-fluid escaping from the valve when opened.

in these drawings,. illustrat.ing the best manner in which I havecontemplated apolvin the nip-sides of the invention. D I

Figure 1 is an axial section of a valve mechanism constructed inaccordance with these principles, and shown without the signal. Fig. 2 across section on the section'line of Fig. 1. Fig. 23 is a side elevationof the valve signal applied to a contiguous, portion of the same valvemechanism. 7 1' in this illustrative specimen of my invention thetubular stem 1 has a terminal coaxial cylindrical hollow head, or cup,2, which opens into the hollow interior of the pneuu'iatie tube. orother receptacle to which the device is to be applied. The wall o't sucha tuhc may be clan'iped between the cup 2. and the nonrotatahle washer 3in the usual manner by inc-ans of the nut 17 working on the externalthreads t of the stem. The annular. or centrally perforated, piston 5.having the tubular pistonrod (3 working in the tubular stem 1,occupies'the cup 2 and is rcciprocahlc therein. The spiral spring 7.suitably compressed between the shoulder S in the stem 1. and theshoulder t) on the rod 6, continually resitsthe variable pneumaticpressure which is exerted upon the ace 01 prising the piston 5; and,whenever the pressure .thereon falls below the predetermined numher ofpounds necessary to be maintained in the tire, this spring impcls thepiston to the extreme position shown in Fig. 1, where it is stopped inthe mouth of the cup by theinbent annular lip 18.

"In the free end of the stem '1 placed valve mechanism ot' an ordinarytype, com I the axially perforated screw plug 10, the similarlyperforated valve seat 11, which is movably attached to the screw plugand is fitted to the stem 1 by the gasket 12,. the valve rod 18, whichworks coaxiallv both in the plug and in the valve seat, the valve l tcarried by the valve rod, and the spiral spring 15 encircling this rod.This valve and the piston-rod 6 are both separated from each other and.connected with each other by this sprin I The screw caplG, constructedas a whistle, is normally placed on the free end of the stem 1, as shownin Fig. and is tempo- 'aril v removed therefrom by hand from time totime, whenever. the tire to be tilled or recharged with air. After theremoval-of this cap, the nozzle of a supply pipe is operatively appliedto the free end of the stem 1 inthe usual manner, and dis charges airunder pressure through the tnbular rod (3 and the piston until thedesired pressure is produced in the tire. By forcing the piston 5 to theinner end of the cup 2, this pressure, so long as it is maintained at orabove the predetermined minimum, holds the spring 7 in compression. Butwhenever the tire pressure is reduced below the minimum, this springdrives the piston 5 to its original position shown in Fig. 1, in whichposition the piston. is stopped by contact with the lips 18; In movingto this position, the piston, acting through the piston-rod t) and theattached spring 15, withdraws the valve 14 from the valve seat '11 andthereby opens a continuous air passage. shown in Fig. 1, from the tireto the whistle positioned as in Fig. 3. Thereupon the whistle is blownDy the air escaping from the tire, whenever the tire pressure fallsunduly. I

I claim as my invention-- l. Valve mechanism of the specified class,comprising a tubular stein adapted atone end to engage the nozzle of asupply pipe and at. the other end to communicate with the interior of apncuniiatic receptacle, a 0y named valve sent 116 'fitt oal to the *0mod! Working valve seat, '21 lo and {will lllg encircling the he valvewith (he I oinovobly capping outer end of inatic irooophncle, a cupformed conxinlly coni'iocl'ion botween the valve and the piston rod, anda whistle removahly fitted over the outer and of the 810m.

In testimony whereof I subscribe my name hereto in the prestonce of twoWitnesses.

ELhfiE-R E. NORGAARD. Witnesses VVlLLARD EDDY, A. M. PoWER.

